Trunk/Liftgate Lid Tamper Switch
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1993 Mercury Cougar, 1993 Lincoln Town Car, 1993 Lincoln Mark VIII, 1993 Lincoln Continental, and 1993 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
Using a digital volt-ohmmeter, measure resistance of trunk/liftgate lid tamper switch. Resistance should be more than 25,000 ohms. If resistance is less than 25,000 ohms, replace tamper switch.